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Sameer Agarwal 747845fc82 Add the GradientChecker. 
The GradientChecker is a utility class written by
William Rucklidge that can be used to check that the
derivatives returned by a cost function match those
returned by numerically differentiating the residuals
returned by the same cost function.

This is useful when developing CostFunction objects
and testing them before plugging them into an optimization
problem.

Change-Id: Ic60f859b48b6246406448555d25556784e097b81
2012-11-08 10:40:18 -08:00
..
ceres
Add the GradientChecker.
2012-11-08 10:40:18 -08:00